USB is a new interface technology used in the computer field. As early as 1995, there were already PCs with USB ports, but due to lack of software and hardware support, the USB ports of these PCs were idle. After 1998, with Microsoft’s built-in support module for USB interface in Windows 98, and the increasing number of USB devices, the USB interface gradually entered the practical stage.
Since the 1920s, with the popularity of a large number of USB-enabled personal computers, USB has gradually become the standard interface for personal computers. On the host side, the latest PCs support almost 100% of USB; on the peripheral side, devices using USB interfaces are also growing, such as digital cameras, scanners, joysticks, tapes and floppy drives, imaging devices, printers, keyboards, and mice. and many more.
The reason why USB devices are widely used has the following advantages:
Can be hot swapped. This allows the user to use the external device without the need to repeatedly shut down the parallel port or serial cable and then turn it on. Instead, the USB cable can be plugged in directly while the computer is working.
Easy to carry. USB devices are mostly small, light and thin. For users, the same 20G hard drive, USB hard drive is half the weight of the IDE hard drive. When you want to carry a lot of data with you, of course, USB hard drive will be the first choice. .
Standards are unified. Commonly used are the hard disk of the IDE interface, the mouse and keyboard of the serial port, and the printer scanner of the parallel port. However, with USB, these application peripherals can be connected to the personal computer with the same standard. At this time, there is a USB hard disk and USB. Mouse, USB printer, etc.
Multiple devices can be connected. USB often has multiple interfaces on a personal computer, and can connect several devices at the same time. If you connect a USB HUB with four ports, you can connect it again; four USB devices, and so on, you can continue Connect your home device to a personal computer without any problems. Note: Up to 127 devices can be connected. But why is there USB0? What is the difference between it and USB1? Please don’t worry, it will be discussed below.
The origin and advantages of USB0